ACUS11 KWNS 130209
SWOMCD
MESOSCALE DISCUSSION 0328
NWS STORM PREDICTION CENTER NORMAN OK
0908 PM CDT SAT APR 12 2014
AREAS AFFECTED...IA...SRN WI...NRN IL
CONCERNING...SEVERE THUNDERSTORM WATCH 70...
VALID 130208Z - 130315Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 70
CONTINUES.
SUMMARY...SEVERE THUNDERSTORM WATCH WILL BE REISSUED TO INCLUDE MOST
OF WW70 AND ADDITIONAL COUNTIES ACROSS NORTHERN IL.
DISCUSSION...NUMEROUS THUNDERSTORMS PERSIST ALONG A CORRIDOR FROM
SWRN IA...NEWD ACROSS SRN WI INTO CNTRL LOWER MI. SCATTERED
EMBEDDED SUPERCELLS HAVE EVOLVED WITHIN A FOCUSED WARM-ADVECTION
ZONE CHARACTERIZED BY STEEP LAPSE RATES AND SUFFICIENT MOISTURE FOR
ROBUST UPDRAFTS/DOWNDRAFTS. 00Z SOUNDING FROM DVN APPEARS TO HAVE
SAMPLED NERN PLUME OF STEEPER LAPSE-RATE ENVIRONMENT AND DEPICTS A
FAIRLY DRY SUBCLOUD LAYER THAT WOULD SEEM SUPPORTIVE OF ENHANCED
DOWNDRAFTS. IF A COLD POOL CAN EVOLVE WITH CNTRL IA CONVECTION THEN
DAMAGING WIND THREAT MAY INCREASE. OTHERWISE...LATEST WDSSII DATA
SUGGESTS NUMEROUS SEVERE HAIL CORES WITH STRONGEST UPDRAFTS. WITH
TIME THIS ACTIVITY MAY SAG INTO NRN IL AND NEW WW WILL EXTEND INTO
THIS REGION TO ACCOUNT FOR INCREASING SEVERE THREAT TOWARD MIDNIGHT.
..DARROW.. 04/13/2014
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...GRB...LOT...MKX...DVN...ARX...DMX...FSD...OAX...
LAT...LON 42519557 44118765 42288777 40779557 42519557
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